genesis_register_sidebar( array(
    'id'          => 'pages-top',
    'name'        => __( 'Pages Top', 'agency' ),
    'description' => __( 'This is the top section on static Pages below nav.', 'agency' ),
) );

add_action( 'genesis_after_header', 'sk_after_after_inner' );
function sk_after_after_inner() {

    if ( is_singular('page' ) || is_singular('post' ) ) {
        genesis_widget_area( 'pages-top', array(
            'before' => '<div id="pages-top" class="widget-area"><div class="wrap">',
            'after'  => '</div></div>',
        ) );
    }

}